The iPhone hacker George Hotz, (aka geohot on Twitter) has done it again. Earlier this year, he made a name for himself in the hacking community as being the first to provide a usable iPhone 3GS jailbreak, which he then followed up by releasing a "better" unlock tool for the same device. Now he's again beaten the iPhone Dev Team to the punch with his release of blackra1n, a jailbreak tool for the Apple's latest iPhone firmware, 3.1.2.
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Unlocking vs Jailbreaking
Jailbreaking and unlocking the iPhone are two different hacks which allow you to take control over your mobile device in different ways. Jailbreaking is a type of hack that lets you install unapproved third-party applications on your iPhone or iPod Touch from searchable repositories provided by apps like Cydia and Icy. Unlocking, on the other hand, is a hack that lets you use your iPhone on another cellular network. Here in the U.S., that means you can use the iPhone on T-Mobile instead of AT&T. You have to first jailbreak your phone before you can unlock it, but you don't have to unlock a phone in